Bradstone Woburn Rumbled Infilta Graphite Block Paving (1 Pack) Bradstone Woburn Rumbled Infilta Rustic Block Paving. The rumbled finish of this block paving allows rainwater to seep beneath to the sub-base because of its permeable texture, stopping the collection of water on the surface.  Available in 3 sizes. Thickness 60mm Size: 200x134 Units Per Pack: 312 m2 Per Pack: 8.43m2 Size: 134 x134 Units Per Pack: 468 m2 Per Pack: 8.35m2 Size: 100x134 Units Per Pack: 624 m2 Per Pack: 8.32m2